[ojAlgo-user] bug report: ILP problem

[Jeff S. <jef...@gm...>]

When I execute the following program:
Minimize
 1*x1
Subject To
 1*x2013 >= 0
 1*x2014 >= 0
 1*x1 >= 0
 -5000.0*x2014 + 5100.0*x2013 + -1.0*x1 <= 0
 -5000.0*x2014 + 5100.0*x2013 + 1.0*x1 >= 0
 5000*x2013 + 5000*x2014 = 19105000
Bounds
Variables
 x2014 integer
 x2013 integer
 x1 continuous

I get these results which are suboptimal:
x1 = 5899.999999996906
x2013 =  1891
x2014 = 1930

Or these results (which seem to occur at random):
x1 = Infinity
x2013 =  0
x2014 = 0

Using another solver, I obtain:
x1 = 4200.000000000075
x2013 = 1892
x2014 = 1929